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Description of Business - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 02, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Description Of Business [Line Items] |  |  |  |  |
IPO closing date | Jul. 02, 2018 |  |  |  |
Net proceeds from initial public offering |  |  | $ 99,998 |  |
Common stock, par value per share |  | $ 0.01 | $ 0.01 |  | $ 0.01
Common stock, shares authorized for issuance |  | 200,000,000 | 200,000,000 |  | 200,000,000
Preferred stock, shares authorized for issuance |  | 10,000,000 | 10,000,000 |  | 10,000,000
Preferred stock, par value per share |  | $ 0.01 | $ 0.01 |  | $ 0.01
Cash and cash equivalents |  | $ 106,760 | $ 106,760 |  | $ 29,147
Accumulated deficit |  | 214,900 | 214,900 |  | 196,946
Cash flows from operating activities |  |  | 18,315 | $ 11,412 | $ 11,100
$35.0 Million Credit Facility | Oxford Finance LLC |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |
Borrowings outstanding under credit facility |  | $ 30,000 | $ 30,000 |  |
Credit facility maturity date |  |  | Mar. 01, 2022 |  |
Common Stock |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |
Common stock shares issued and sold |  | 6,325,000 |  |  |
Convertible preferred stock converted into common stock |  | 10,994,000 |  |  |
Initial Public Offering |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |
Net proceeds from initial public offering | $ 96,500 |  |  |  |
Common stock, par value per share | $ 0.01 |  |  |  |
Common stock, shares authorized for issuance | 200,000,000 |  |  |  |
Preferred stock, shares authorized for issuance | 10,000,000 |  |  |  |
Preferred stock, par value per share | $ 0.01 |  |  |  |
Initial Public Offering | Common Stock |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |
Common stock shares issued and sold | 6,325,000 |  |  |  |
Issuance price per share | $ 17.00 |  |  |  |
Convertible preferred stock converted into common stock | 11,000,000 |  |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3044-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3536-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3521-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 + Details
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